How does this pre-seed work?

Ha

Me and my fiancé are having trouble TTC. We’ve tried 3 times so far, and NOTHING. :( I use to be fertile myrtle over here! I had my first kid with her sperm donor just like that, first try. And before her we tried years before that, and I got pregnant that time as well before I miscarried. I have a 2 yr old now, we feel it’s time in our relationship and for her to have a sibling and want another so bad, but feeling very discouraged. Any advice, tips, success stories using this Pre-seed, anything to make me feel better and want to not give up.